ATUC128L4U Atmel Corporation, ATUC128L4U Datasheet - Page 439
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ATUC128L4U
Manufacturer Part Number
ATUC128L4U
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT32UC3A0128.pdf
(377 pages)
2.AT32UC3A0128.pdf
(159 pages)
3.ATUC128L4U.pdf
(960 pages)
4.ATUC128L4U.pdf
(92 pages)
Specifications of ATUC128L4U
Flash (kbytes)
128 Kbytes
Pin Count
48
Max. Operating Frequency
50 MHz
Cpu
32-bit AVR
# Of Touch Channels
17
Hardware Qtouch Acquisition
Yes
Max I/o Pins
36
Ext Interrupts
36
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
2
Uart
4
Lin
4
Ssc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
12
Adc Speed (ksps)
460
Analog Comparators
8
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
16
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.62 to 3.6
Operating Voltage (vcc)
1.62 to 3.6
Fpu
No
Mpu / Mmu
Yes / No
Timers
6
Output Compare Channels
18
Input Capture Channels
12
Pwm Channels
35
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATUC128L4U-U
Manufacturer:
ATMEL
Quantity:
3 006
- AT32UC3A0128 PDF datasheet
- AT32UC3A0128 PDF datasheet #2
- ATUC128L4U PDF datasheet #3
- ATUC128L4U PDF datasheet #4
- Current page: 439 of 960
- Download datasheet (15Mb)
Figure 20-3. Fractional Baud Rate Generator
20.6.1.4
20.6.2
32142A–12/2011
CLK_USART/DIV
CLK
CLK_USART
Reserved
Receiver and Transmitter Control
Baud Rate in Synchronous and SPI Mode
USCLKS
1
2
3
0
If the USART is configured to operate in synchronous mode, the selected clock is divided by the
BRGR.CD field. This does not apply when CLK is selected.
When CLK is selected the external frequency must be at least 4.5 times lower than the system
clock, and when either CLK or CLK_USART/DIV are selected, CD must be even to ensure a
50/50 duty cycle. If CLK_USART is selected, the generator ensures this regardless of value.
After a reset, the transceiver is disabled. The receiver/transmitter is enabled by writing a one to
either the Receiver Enable, or Transmitter Enable bit in the Control Register (CR.RXEN, or
CR.TXEN). They may be enabled together and can be configured both before and after they
have been enabled. The user can reset the USART receiver/transmitter at any time by writing a
one to either the Reset Receiver (CR.RSTRX), or Reset Transmitter (CR.RSTTX) bit. This soft-
ware reset clears status bits and resets internal state machines, immediately halting any
communication. The user interface configuration registers will retain their values.
The user can disable the receiver/transmitter by writing a one to either the Receiver Disable, or
Transmitter Disable bit (CR.RXDIS, or CR.TXDIS). If the receiver is disabled during a character
reception, the USART will wait for the current character to be received before disabling. If the
transmitter is disabled during transmission, the USART will wait until both the current character
and the character stored in the Transmitter Holding Register (THR) are transmitted before dis-
abling. If a timeguard has been implemented it will remain functional during the transaction.
BaudRate
16-bit Counter
CD
Modulus
=
Control
FP
SelectedClock
------------------------------------- -
CD
glitch-free
USCLKS = 3
logic
FP
SYNC
0
>1
CD
0
1
0
1
ATUC64/128/256L3/4U
OVER
Sampling
Divider
FIDI
0
1
SYNC
CLK
BaudRate
Sampling
Clock
Clock
439
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